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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net deferred gains (losses) on derivatives-hedging activities, tax $ (37) $ (74) $ (20)
Changes in unrealized net gains (losses) on investment securities, tax (53) 23 (59)
Changes in net unrecognized pension and other postretirement benefit costs, tax 189 29 189
Net derivative (gains) losses-hedging activities, tax 100 68 (59)
Net realized (gains) losses on investment securities, tax 15 29 33
Net pension and other postretirement benefit costs, tax (22) (35) (24)
Changes in other comprehensive income (loss) from equity method investees, tax 0 1 3
Virginia Electric and Power Company      
Net deferred gains (losses) on derivatives-hedging activities, tax 1 2 2
Changes in unrealized net gains (losses) on investment securities, tax (7) 1 (9)
Net derivative (gains) losses-hedging activities, tax 0 0 2
Net realized (gains) losses on investment securities, tax 2 4 4
Dominion Gas Holdings, LLC      
Net deferred gains (losses) on derivatives-hedging activities, tax 10 (4) 19
Changes in net unrecognized pension and other postretirement benefit costs, tax 14 13 6
Net derivative (gains) losses-hedging activities, tax (6) 3 (5)
Net pension and other postretirement benefit costs, tax $ (2) $ (3) $ (3)